####################################################################################################################################
# ExecuteTest.pm - Module to execute external commands
####################################################################################################################################
package pgBackRestTest::Common::ExecuteTest;

####################################################################################################################################
# Perl includes
####################################################################################################################################
use strict;
use warnings FATAL => qw(all);
use Carp qw(confess);

use Exporter qw(import);
    our @EXPORT = qw();
use IO::Select;
use IPC::Open3;
use POSIX ':sys_wait_h';
use Symbol 'gensym';

use pgBackRestDoc::Common::Log;

use pgBackRestTest::Common::Io::Handle;
use pgBackRestTest::Common::Io::Buffered;
use pgBackRestTest::Common::Wait;

####################################################################################################################################
# new
####################################################################################################################################
sub new
{
    my $class = shift;          # Class name

    # Create the class hash
    my $self = {};
    bless $self, $class;

    # Assign function parameters, defaults, and log debug info
    (
        my $strOperation,
        $self->{strCommand},
        my $oParam
    ) =
        logDebugParam
        (
            __PACKAGE__ . '->new', \@_,
            {name => 'strCommand'},
            {name => 'oParam', required => false}
        );

    # Load params
    foreach my $strParam (sort(keys(%$oParam)))
    {
        $self->{$strParam} = $$oParam{$strParam};
    }

    # Set defaults
    $self->{bSuppressError} = defined($self->{bSuppressError}) ? $self->{bSuppressError} : false;
    $self->{bSuppressStdErr} = defined($self->{bSuppressStdErr}) ? $self->{bSuppressStdErr} : false;
    $self->{bOutLogOnError} = defined($self->{bOutLogOnError}) ? $self->{bOutLogOnError} : true;
    $self->{bShowOutput} = defined($self->{bShowOutput}) ? $self->{bShowOutput} : false;
    $self->{bShowOutputAsync} = defined($self->{bShowOutputAsync}) ? $self->{bShowOutputAsync} : false;
    $self->{iExpectedExitStatus} = defined($self->{iExpectedExitStatus}) ? $self->{iExpectedExitStatus} : 0;
    $self->{iRetrySeconds} = defined($self->{iRetrySeconds}) ? $self->{iRetrySeconds} : undef;
    $self->{bLogOutput} = defined($self->{bLogOutput}) ? $self->{bLogOutput} : true;

    # Return from function and log return values if any
    return logDebugReturn
    (
        $strOperation,
        {name => 'self', value => $self}
    );
}

####################################################################################################################################
# begin
####################################################################################################################################
sub begin
{
    my $self = shift;

    # Assign function parameters, defaults, and log debug info
    my ($strOperation) = logDebugParam(__PACKAGE__ . '->begin');

    $self->{strErrorLog} = '';
    $self->{strOutLog} = '';

    if (defined($self->{oTestLog}))
    {
        if (defined($self->{strComment}))
        {
            $self->{strFullLog} = $self->{oTestLog}->regExpAll($self->{strComment}) . "\n";
        }

        $self->{strFullLog} .= '> ' . $self->{oTestLog}->regExpAll($self->{strCommand}) . "\n" . ('-' x '132') . "\n";
    }

    &log(DETAIL, "executing command: $self->{strCommand}");

    # Execute the command
    $self->{hError} = gensym;

    $self->{pId} = open3(undef, $self->{hOut}, $self->{hError}, $self->{strCommand});

    # Create buffered read object
    $self->{oIo} = new pgBackRestTest::Common::Io::Buffered(new pgBackRestTest::Common::Io::Handle('exec test', $self->{hOut}), 0, 65536);

    # Create buffered error object
    $self->{oIoError} = new pgBackRestTest::Common::Io::Buffered(
        new pgBackRestTest::Common::Io::Handle('exec test', $self->{hError}), 0, 65536);

    # Record start time and set process timeout
    $self->{iProcessTimeout} = 300;
    $self->{iProcessTimeoutTotal} = 4;
    $self->{lTimeLast} = time();

    if (!defined($self->{hError}))
    {
        confess 'STDERR handle is undefined';
    }

    return logDebugReturn($strOperation);
}

####################################################################################################################################
# endRetry
####################################################################################################################################
sub endRetry
{
    my $self = shift;

    # Assign function parameters, defaults, and log debug info
    my
    (
        $strOperation,
        $bWait
    ) =
        logDebugParam
        (
            __PACKAGE__ . '->endRetry', \@_,
            {name => 'bWait', required => false, default => true, trace => true}
        );

    # Drain the output and error streams and look for test points
    while (waitpid($self->{pId}, WNOHANG) == 0)
    {
        my $bFound = false;

        # Error if process has been running longer than timeout
        if (time() - $self->{lTimeLast} > $self->{iProcessTimeout})
        {
            if ($self->{iProcessTimeoutTotal} > 0)
            {
                &log(WARN, "process has been running for $self->{iProcessTimeout} seconds with no output");
                $self->{iProcessTimeoutTotal}--;
                $self->{lTimeLast} = time();
            }
            else
            {
                confess &log(ASSERT, "timeout waiting for process to complete: $self->{strCommand}");
            }
        }

        # Drain the stdout stream and look for test points
        while (defined(my $strLine = $self->{oIo}->readLine(true, false)))
        {
            $self->{lTimeLast} = time();

            $self->{strOutLog} .= "${strLine}\n";
            $bFound = true;

            if ($self->{bShowOutputAsync})
            {
                syswrite(*STDOUT, "    ${strLine}\n")
            }
        }

        # Drain the stderr stream
        while (defined(my $strLine = $self->{oIoError}->readLine(true, false)))
        {
            $self->{strErrorLog} .= "${strLine}\n";
        }

        if (!$bWait)
        {
            return;
        }

        if (!$bFound)
        {
            waitHiRes(.05);
        }
    }

    # Check the exit status
    my $iExitStatus = ${^CHILD_ERROR_NATIVE} >> 8;

    # Drain the stdout stream
    while (defined(my $strLine = $self->{oIo}->readLine(true, false)))
    {
        $self->{strOutLog} .= "${strLine}\n";

        if ($self->{bShowOutputAsync})
        {
            syswrite(*STDOUT, "    ${strLine}\n")
        }
    }

    # Drain the stderr stream
    while (defined(my $strLine = $self->{oIoError}->readLine(true, false)))
    {
        $self->{strErrorLog} .= "${strLine}\n";
    }

    # If an error was expected then return success if that error occurred
    if ($self->{iExpectedExitStatus} != 0 && $iExitStatus == $self->{iExpectedExitStatus})
    {
        return $iExitStatus;
    }

    if ($iExitStatus != 0 || ($self->{iExpectedExitStatus} != 0 && $iExitStatus != $self->{iExpectedExitStatus}))
    {
        if ($self->{bSuppressError})
        {
            &log(DEBUG, "suppressed error was ${iExitStatus}");

            # Make a copy of the suppressed error log in case it is needed
            $self->{strSuppressedErrorLog} = $self->{strErrorLog};
        }
        else
        {
            if (defined($self->{iRetrySeconds}))
            {
                $self->{bRetry} = true;
                return;
            }
            else
            {
                confess &log(ERROR, "command '$self->{strCommand}' returned " . $iExitStatus .
                             ($self->{iExpectedExitStatus} != 0 ? ", but $self->{iExpectedExitStatus} was expected" : '') . "\n" .
                             ($self->{strOutLog} ne '' && $self->{bOutLogOnError} ? "STDOUT (last 10,000 characters):\n" .
                                substr(
                                    $self->{strOutLog}, length($self->{strOutLog}) > 10000 ?
                                    length($self->{strOutLog}) - 10000 : 0) : '') .
                             ($self->{strErrorLog} ne '' ? "STDERR:\n$self->{strErrorLog}" : ''));
            }
        }
    }

    if ($self->{strErrorLog} ne '' && !$self->{bSuppressStdErr} && !$self->{bSuppressError})
    {
        confess &log(ERROR, "STDOUT:\n$self->{strOutLog}\n\noutput found on STDERR:\n$self->{strErrorLog}");
    }

    if ($self->{bShowOutput})
    {
        print "output:\n$self->{strOutLog}\n";
    }

    # Return from function and log return values if any
    return logDebugReturn
    (
        $strOperation,
        {name => 'iExitStatus', value => $iExitStatus, trace => true}
    );
}

####################################################################################################################################
# end
####################################################################################################################################
sub end
{
    my $self = shift;

    # Assign function parameters, defaults, and log debug info
    my
    (
        $strOperation,
        $bWait
    ) =
        logDebugParam
        (
            __PACKAGE__ . '->end', \@_,
            {name => 'bWait', required => false, default => true, trace => true}
        );

    # If retry is not defined then run endRetry() one time
    my $iExitStatus;

    if (!defined($self->{iRetrySeconds}))
    {
        $iExitStatus = $self->endRetry($bWait);
    }
    # Else loop until success or timeout
    else
    {
        my $oWait = waitInit($self->{iRetrySeconds});

        do
        {
            $self->{bRetry} = false;
            $self->begin();
            $iExitStatus = $self->endRetry($bWait);

            if ($self->{bRetry})
            {
                &log(TRACE, 'error executing statement - retry');
            }
        }
        while ($self->{bRetry} && waitMore($oWait));

        if ($self->{bRetry})
        {
            $self->begin();
            $iExitStatus = $self->endRetry($bWait);
        }
    }

    # Return from function and log return values if any
    return logDebugReturn
    (
        $strOperation,
        {name => 'iExitStatus', value => $iExitStatus, trace => true}
    );
}

####################################################################################################################################
# executeTest
####################################################################################################################################
sub executeTest
{
    my $strCommand = shift;
    my $oParam = shift;

    my $oExec = new pgBackRestTest::Common::ExecuteTest($strCommand, $oParam);
    $oExec->begin();
    $oExec->end();

    return $oExec->{strOutLog};
}

push @EXPORT, qw(executeTest);

1;